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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1acf2ab53e3fcbe5b7aa4d7e5654bc0c3453ad4a6e59598b1a905062eb9149' 
  AND token = '9bfh6UBZBcutX/sQhxItkMHrnMZye0LDv4Lb9RCyjOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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