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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a99998c536d0c5172a71271aad295273c5d132ff71d0b4bdfede5b6026e42f0' 
  AND token = 'dtc/2dIf6rhpDG09nWsOHqoRzfhM5enLFKhlAUpqr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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