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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c884e9ce894273e9286fb9eee0385a7a128c95c3dbaf2d62651e9ad2773d040' 
  AND token = '5oSU6g7BcLOmPb74wvqnK5d3IezeL2+YWdVSzkwq2Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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