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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccad1003bf7ea94a9033e99486beec5ecafec47222ab6a0f97ec2dbcd756152' 
  AND token = 'uwjCa5y0bUlAhgokox9ob7sym/zK2Vrwk759+laxWnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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