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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4db9b99bcc2b2f27195c1aa7c5ab326c779b8f57e645eda8d917ef5adca94b' 
  AND token = 'nL7WKsHR+LnGhSa6ryz53560a9WwnnjvadvktuTL58A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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