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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2908cc5f6de4dc11021fc7f3bb4982b912a106dca88e1e507d0881371c3eacb2' 
  AND token = '0zRTgGysaFJvLOeKA7+d9HY/LbfVQ304DvgFenZMtBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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