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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dcacc0bf450e83c69812ee5fb2e44243aba21d90dc5e4b205fb746d93ed2f1' 
  AND token = 'f5kqPa1OmiFkd4Rsht4qZYoAFrFp5phUIKJdbBzoywM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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