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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dd1b99a808d734f31d8e3e5cde5837a678f1abf0c00abb8cc781bfd9212b98' 
  AND token = 'ZG5HjXITvbsbL26002NogtXaPN06EaQUCybiIfAWMdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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