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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669ef1c22da278dbfcc73f816e3c3ce047fe3776d1b948beba01dfac4d8cd2fd' 
  AND token = 'P05vcmN18qvBsz768Lw461rElnjNWyfqGHSZj3jdsB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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