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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c47087851db074101006bbe67a22b7336c501ea84195779a410a15ab214cd21' 
  AND token = 'P8JA/sD3wQ9aUPVa4/1S/k+qjeZzbvyI9MOeW22iTVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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