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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832eb99b1e052683df092f1ad3e1f58bff3cc011372291a8681aee91ff2c7390' 
  AND token = '8e/3c9fFBanarWMYB56e+3cb31egFy8lYeX0JHiPB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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