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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2bc765d6464315523d81575bcc73088f6d1f85dc21d90c2f8ff6900eb04372' 
  AND token = 'WwJcQTTNLFxKdqtXX4j44VNlEWscKC3RaG8IjfT3N8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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