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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c948023bbcb5e65e694f6878a272e26baed9bdcb08151e43a7201b71c6922165' 
  AND token = '7BN+D18oA+8bAMUMSuC0vHC9bk3C4di2cGlTzynsmC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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