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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e6a802a6cfeb5bdd03ee3659f34ad04424dc554ce1cc8cfd1592290a366ee5' 
  AND token = 'Hy7KhjT0yq130mKJmeinadHQodtMdxPXcOa0e4jiy2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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