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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6c27e44a4cd1c61340f134829ba2baae4d53fdabb45bd1ddad2a8d9b937e1f' 
  AND token = 'TDRywxa8RyYUf4Jcu/xz1cD1ILT9C1+0B/t0hVVcSFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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