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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232fa4a88b09c8ced5ac4d1fa9cf5ff5c4bdfff1242a221fa5ded35c224a126e' 
  AND token = 'Gz2blkJaQKOlFVJ4TC69/zJnYB+VuxIdysqeQDOcEZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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