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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa6bff98fb02572b89c9e06dc8be9f01bd481d22b6c7ad461be3bd7b67a1c25' 
  AND token = 'M0aNEftrIVav6FFZCy3ginFbdMfDrN7TpI/olWCHU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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