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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebc71b052cbfd68991d076f4021b54e4e8aaec39d5eedea7f5601345bfcc86f' 
  AND token = 'pPKrG3qSHJNjXT11jKe2Dl9X2YRHfZH3P9nc7hwT58g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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