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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbe5025531fb848bb41e26cf789b76acb0bfb3279900ec8c493f1163e156bbc' 
  AND token = '11rWMRb7D1QOeDtaPIKMHGpctxBdco9h7r03Z9a9RHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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