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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06470fef37b0445f0776bd4cadad202e424c7e5938989c8b82fb72ea3e446a0' 
  AND token = '1T55iAmHaCrTBq5uoX8F45dru48xTzVCN3Qj4nzXow0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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