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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1468ed2c58dceae687af79eef69f87a18172fa085f6a3244dcc22c52f6c3e935' 
  AND token = 'P4oFUcVF3UQtHDTkQrNvPM3XkUk+JDqbBnRGPboCRcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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