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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ecd8887fcec043718536e114a6e95640fa550710e4695de65a8d85eeda0e37' 
  AND token = 'V54VOBf8gJrBCZ50fXOQql613WBrVEBgVpHg9t1Cq6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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