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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c113295be220736dd260548932ab17169a80601acf729e79d2d23f42df91556' 
  AND token = 'z+et7Yk30CU88E6spOluSkNm31bExHYZ4Srzeo4Qe/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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