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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b578f35acd8d1ec258f656494725b6f8ff4333a66b201c44fbe04e13584c4f' 
  AND token = 'Z5FrMsNsHbIvnw6fJb2EH1wMvbWrPoVfA8FN3bfQHwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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