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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5614bd08d5b534dde8343ae48eb8ca54e52e7485b82d633b5eeb45209b4d76' 
  AND token = 'ADym3QAPQ6OegFa52U2geRdPWGkZC1cee6HQPLPsbJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}