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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69035230b935923f8b181d005d6d5f9a3dc64315e0bff9908e2a607cbc07f9c' 
  AND token = 'ZQFokStSqpqxBmG5dYGc8ggKZRYjtrt/TBQPsWfMj0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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