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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dbe56794487440a363991f61b6b46902063d88b45b3377c1da719ef0b7072a' 
  AND token = 'MlS1ZfqBQZPxRlh0XsMWa0qdn2rzDr2nCZLM4OjwHrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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