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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495e92d7f8e9bfcdf40beaa7d3626fc10e289bf0aa392e476c9fef5cea4ba084' 
  AND token = 'fcVzaCx3E9Rms9Buysf2CBQaqJPp2nI5s6gWnCDeie4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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