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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaa4c0ca6f7da7fbf5a5b929e7d2d858bb99e148d5e003c61b5874ce9d9a387' 
  AND token = 'lv2SMsIVnrkqtpf6+lZTxF466bTrA5t7WVLkr/9gg6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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