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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3be3a6d9f503ee695992c1b03c2f2684a091be9acefe1e8207a234b708aee07' 
  AND token = 'G5Z9qFjPSdk1NszYb6j7R5d/dJR08xaT3mAjzDduzAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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