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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd359aaee7c7bd21636bc21bdd1a8eb35eb0133979504fca14cbdaae4bda8a6c9' 
  AND token = '/YBuIGdx7hnhpP8OOM2k/TZn4xvauBkaVmhKW7T17nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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