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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f67750201816bc6c310bf5e4970876a2d616b9fa8740103499ab3e579d4cbec' 
  AND token = '/l8oxic2YQgcA/aXMlonV7BtJuRFxZOXlqBv1Vp67I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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