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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b86e94c1c827621d0ebee826600f60c0e7f9cc894975ae019954ce60bd390c' 
  AND token = 's2EjVcFkka1joEUtdUWzzljSFVeZA76fzQXH1KYGvHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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