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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957e6519a360ffc2b842b38bab41913e27885731923703282c04901cd66f8eae' 
  AND token = '0tTzJiWk0MGct6wHG2ylypDtyKwcbSRLwVhA6zIx+bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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