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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cee6ec6dc63c2556e2c3be0cb220ba0652c0f525f82654a77209b036a412f1' 
  AND token = 'ytI2aGfedNePd+7j6pBFi65Lk5a2viG0WhfzG565C8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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