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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcce84a0da23602e42b2e2f3d83f61774ced6054cbf8ed37c3024c92ae5e0abe' 
  AND token = 'XFNn/jLIAp0peldbHnF9859K7FgBNfnfvs0QnTWTpSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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