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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb70297bca82fe3e1d4fec2dba34e5f8931012b1f8c09a73d21ccda350d0aaf' 
  AND token = 'l33C7eae4hzXipD7u9iIuifvhx6vCbQ3WfvyXmp37Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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