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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae2823ebf9fad9b82146a82fd87d3eae2702b4c3a8df6c8b06661900bc8104d' 
  AND token = 'jYGbT5Uytta2nQ41dapfjNy5MQyi8P3gQv5MMn/6ZnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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