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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da91a47ca33ab381fe9a2b3d7017a747a5702011c2345629d6a0ca3373e6d5d' 
  AND token = 'nHH3ZbW40KfHR59MHA53WR6e1xTu8O/BUmEtx9OtxLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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