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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbafa10c2bd567f7ad6949cb05719bdcfe474cae3e5b6eb1bb65ce17f41dc055' 
  AND token = 'ljE0D4sRnQtJu+5p/7eOogDb4hSmquRVtWcj72OGV8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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