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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fd7fb83d138177c920d3beb9f44dea925c7d2ff545d1c6c1d3a8a4f6f037b2' 
  AND token = 'p74Cy5nzBXqHNcJaVmjY0zPFeUHEm9MB80oT7ycNyhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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