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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84afb57bd08aecfa4713328a2d9976c83e9eceb61c6b7238005df1efdc1bc523' 
  AND token = 'MORHvuAw0PXUTvZkvWjKul0mxw+AScMEDYQ+e4nTXck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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