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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d7f0321526d0f27f8153263aaf5dbd97dc76379f1170a8b465e54ea08b4a2f' 
  AND token = 'tjUyLuw6lWHRyZaqNdEkzblL6OLWPgJaubjlO2cFZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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