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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58db8cd42b5e2a8222ac2e8ede14be2392eca7530c0f46d085611dbda52555be' 
  AND token = 'pGMroG1tqFgoBAV+0YoH5COJesq+9hdS7ajPU9zZpwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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