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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe16ebdcff59b4c2a791cbc8542ca2afdf623eabb4152039211c91532dd2ac9d' 
  AND token = '7lyE40KRVKc3qucj4ua44bal6oP8nHp2W0xX7OWRfYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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