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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51adbe8318ed92d4396d5b631c4ff997f21cead9316cadcabe2fc39f1c7f921a' 
  AND token = '0wxGzXsfexikKLeNtwlI96y3fIg2GwQ/w9q/GlFY6kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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