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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04940df60b206d22ed7317b90fd1899d4e4a8b355b37b64fd129f5c3da62bf57' 
  AND token = 'Lg7P6MznDOfro2NbXCyrzlZxXfymx98YQ5X2X3jkJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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