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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975111ffb6554b8ab4504ee4e6fb2ba9d7a2a27a6ddd119f1114052b8be9f736' 
  AND token = '5WWHnzkSkXvb5fqQPkFMhehHITGpwB/Svb4LFp5ZFsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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