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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f9a7203e3098175a905600cb261245118833850707211723ad69af8f1b6194' 
  AND token = 'ECNL3oEJclpRGLxBX/IdOtTEX6c26D+wdDvwDNyptD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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