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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f31c7eb4ab43254ab639eb4b186a70ac4f13134217718b4d381acadd14d829' 
  AND token = 'kEXZ5sAEIufEAP2a/zbL/Z/oNnknOn6t971z43tm1Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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