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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d911a279c2c62feb4b883ee8b78784e4282175f965511fe7697eb026714c5ac' 
  AND token = '9c2doAZnn77nhLAR6e+/4wai+1t4dLs/YYXCl4tqWPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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