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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcd4b2d4237a7cd0159b3182b48b4b2def2a0676195085474468e1ebf62f5d3' 
  AND token = 'SXIf7NK1HOSTEHmosLhJcQKtpsxPKX1sNEklq1HcsVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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