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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ba1b067c0cbd4a567adb45d7d413fcf60f329537e841498852916ae574c6c8' 
  AND token = 'BM8ZaCeNhgH2EZCs0ctChCmM+H9/wP5SX6cNVK29os4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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