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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff8ef53c71de2b8ad103f79dd08eae556b8fef7b468c46b9d5a3052244dcbf0' 
  AND token = 'ZbWTfDkCjVvyrM8q73oG4Obgae5RjGQVsRwuL3tNDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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