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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43bbee72d602d78785dd52bb7e0b5dde032c988e6322a53d1c2cb39c40eff0c' 
  AND token = 'iWUoa257fvScfn6c7D2lBt5QJPQVtP7b4cy7wCMU86A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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