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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5bffae830e4950eb4295463f97fc7c4c974046aa8652674005fde97b25c722' 
  AND token = '+09jM0OZqlZVZaThR1V3kf8QNOPQRazc1Qn6hJ4c1lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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