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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc264a80b0ab8f0ab5cf0e0fe6c388ba5e86dc49d6247957da335590a155b84' 
  AND token = '9vKhrHkYkz/9fetQLadzbc0Szi+ZNVfDVTCCpt2giQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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