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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adfc69a44beff19c1ae1b426f2b554fab247471f384dec42f6efadfc50171c5' 
  AND token = '+u6T1tESGP9pF/qX+BL7mbesI+2JZZTJhday5M0Wais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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