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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93937df77f9c50b792894df41595bd09698f12499bc2f5648999665ee8fa95b' 
  AND token = 'FOe8meE1UC9CSFA4M38k5WRPkT5z4Iioi3DGvMRTTkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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