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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7a3461c6bcb7ba67aa4d1424a1dc0f5a7dad247843bfe52ad944f22eb330e8' 
  AND token = 'HmDPpa/PqKeXOn+D4knkgdPh6/+kou51e2WC/CD03zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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