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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39fd23dd8087598eaac24e78c3fe607652ece9bf5ca007dc48fe27763587a84' 
  AND token = 'o38ybFq3W+AyYpfCdXqP1NUDGgXjlDCeANOdrWPMt1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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