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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948c3384fa490f4de0e29b875c52e9d3a4a15c9a9945657174bc8acb586e3971' 
  AND token = 'Pkujg7W81bPm0ZMoOCsxHo9RBZrkJmvcnxtxUlcnZkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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