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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9699da77de55bd269f94ceefd07ade51650c9c187f980f8ab66c7f0b255cf68f' 
  AND token = 'Z3aRE6EkuvxAp4nzoacQgKpVolnWHbGGAwgA2Nypyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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