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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec8798bd4ea08f4fc904b7f3148ef735e623c874916720d8cb9ec70312bbe13' 
  AND token = 'KSas7J4aC0orgNhWzfMpnuFpGqb77rJZkeuCBugK7m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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